cr:6.6.5b

An event-based triggered effect only triggers if an event that meets the triggered condition occurs. If the event is modified before it occurs and no longer meets the triggered condition, the effect does not trigger.[6.4] If the trigger condition also includes a state-trigger condition, that condition must also be met by the game state at the time the event occurs for the effect to trigger.

Example: Bloodrot Trap has the text “When this defends and the attacking hero has played or activated a reaction this chain link,” which is a triggered effect with both an event- and state-based trigger. When Bloodrot Trap defends, the effect only triggers if the state-based condition is also met - the attacking hero has played or activated a reaction this chain link.